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From: "Don Wilhelm"
To: "Wolf-Ruediger Juergens" ,
"Elecraft List"
Subject: Re: [Elecraft] Problem with BFO adjusting
Date: Fri, 14 Mar 2003 19:41:16 -0500
20 or 30 Hz may be the best you can obtain due to the DAC resolution. It
may appear that you have it "right" but you may be just a Hz or 2 away from
the 'step' point provided by the DAC setting firmware, and it stores not the
value that you had intended, but the one next to it. You can try repeating
the setting several times until it really stores the value you had
intended - some folks have reported success with repeated stores.
These digital things have jumps in them - it is not as smooth as analog -
but it is more stableand repeatable. I guess we can't have both without
spending a large fortune for a transceiver with smaller digital steps.
73,
Don W3FPR
----- Original Message -----
...
> the Byrdie was exactly at the marker. Starting with 400Hz and than 600Hz,
> 1khz
> and at last the OPT1 (2,2khz). No problem, execpt the following happens:
> I tuned the BFO for OPT1 so that the Byrdie is as near as possible to the
> Marker.
> After storing, switching the filters until OP1 filter became active
again.
> Than the
> Byrdie is abt 20Hz higher. I know that the resolution of the BFO is
limited
> but
> why can I move the BFO to the right point but not store this value?
> Is there a limitation in the eeprom value? Or did I something wrong?
> Firmware is 2.02H. K2 #2857
>
> 73 de Wolf, DL2WRJ
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From: "David Walker"
To: "Gary"
Cc:
Date: Tue, 18 Mar 2003 08:08:03 +1100
Subject: [Elecraft] Re: VK2ICQ: RE: BFO settings?
Hi Garry,
Thanks for the tip.... I've downloaded spectrogram before and its gone past
it's demo period so it won't work for me. However, I used JE3HHT's DSP
filter because it shows the same thing as spectrogram - and it's FREE!
My filters for SSB were perfect but my CW filter's were very skewed. I have
them perfect now.
Thanks,
Dave.
----- Original Message -----
From: "Gary"
To: "'David Walker'"
Cc: "CSinfo"
Sent: Tuesday, March 18, 2003 4:27 AM
Subject: VK2ICQ: RE: BFO settings?
> Hi David,
>
> Use the info on our website to do CAL FIL optimally:
>
> General info on Spectrogram, including how to download it:
>
> http://www.elecraft.com/Apps/new_fil_docs/filter_apps.htm
>
> The CW method to adjust CAL FIL:
>
> http://www.elecraft.com/Apps/new_fil_docs/k2_cw_gram.pdf
>
> The SSB method:
>
> http://www.elecraft.com/Apps/new_fil_docs/k2_ssb_gram.pdf
>
> The 2nd XFIL mod we recommend when the SSB adapter is installed:
>
> http://www.elecraft.com/Apps/new_fil_docs/k2_2nd_xfil_ssb_mod.pdf
>
> (not needed on sn. 3000 kits and above.)
>
>
> CAL S LO and CAL S HI often need to be redone whenever CAL FIL is done
> and the BFO is changed.
>
>
> Narrower CW filters will have less fidelity than the wider fixed SSB
> filter, if that is what you mean.
>
>
> --
> 73, Gary AB7MY
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From: "Bob - AG5Q"
To: "David Walker" , "Gary"
Cc:
Subject: Re: [Elecraft] Re: VK2ICQ: RE: BFO settings?
Date: Mon, 17 Mar 2003 16:25:58 -0600
For those who would like to get Spectrogram, the freeware version is still available:
http://www.hitsquad.com/smm/programs/SPECTROGRAM/
This seems to have all the capability you need for aligning a K2.
73/ Bob - AG5Q
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